METHOD FOR THE PRODUCTION OF A HOP EXTRACT WHICH IS ENRICHED IN 8-PRENYLNARINGENIN WITH RESPECT TO 6-PRENYLNARINGENIN, USE THEREOF, FOOD ADDITIVE AND COSMETIC COMPOSITION CONTAINING HOP EXTRACT

摘要

The present invention relates to a method for the production of a hop extract which is enriched in 8-prenylnaringenin with respect to 6-prenylnaringenin, which method comprises the steps of subjecting a hop product to (1) an isomerisation reaction in the presence of water as a solvent and in the presence of an amount of a base and (2) to at least one extraction. In that way a hop extract may be extract is obtained which contains 6-prenylnaringenin and 8-prenyinaringening in a ratio (8-prenylnaringenin x 100%)/(8-prenylnaringenin + 6-prenylnaringenin) of at least 50%. The extract preferably also contains xanthohumol, the weight ratio of xanthohumol to 8-prenylnaringenin being at least 10.